LoRa

http://www.microchip.com/pagehandler/en-us/technology/personalareanetworks/technology/lora.html#utm_medium=Press-Release&utm_term=RN2483_PR_3-2-15&utm_content=WPD&utm_campaign=LoRa+Module

News article in Korean,
  http://m.betanews.net/bbs/read.html?num=620227

5 Km range in city area
15 Km range in field
10 years battery duration